Finding the Third Proportional to 39,690 and 52,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,690 : 52,912.50 = 52,912.50 : x
2. Step 2: Convert to fraction form
   39,690/52,912.50 = 52,912.50/x
3. Step 3: Cross multiply
   39,690x = 52,912.50 × 52,912.50
4. Step 4: Simplify right side
   39,690x = 2,799,732,656.25
5. Step 5: Solve for x
   x = 2,799,732,656.25/39,690
6. Step 6: Final answer
   x = 70,540.00